ANKYLOSING SPONDYLITIS
Note the following :
- marginal syndesmophytes
- Dagger sign - ossification of supraspinous and interspinous ligaments on AP films
- Trolley track spine - Three vertical lines visualised as a result of ossification of facetal joints and supraspinous and interspinous ligaments on AP films
- Squaring of vertebral body, Romanus lesion, shiny corner sign, discal ballooning
- whiskering at entheses (at the inferior pubic ramus in this case)
Complications:
- Andersson\'s lesion (pseudo-arthrosis)
- carrot stick fractures
- arachnoid diverticulae
- ankylosis of joint prosthesis
- atlantoaxial rotary subluxation